html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}
a {
  color: #fff;
}
.operation-container {
  position: absolute;
  right: 20px;
  top: 30px;
  color: #fff;
}
.operation-container > div {
  margin-bottom: 10px;
}
.operation-container label {
  width: 30px;
  display: inline-block;
  vertical-align: top;
}
.operation-container span {
  width: 150px;
  display: inline-block;
  vertical-align: top;
  text-align: right;
}
.range {
  opacity: 0.9;
  width: 180px;
  border-radius: 10px;
  background-color: #fff;
  vertical-align: top;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  -webkit-box-shadow: 0 0 2px;
  width: 2.6rem;
  height: 1.6rem;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 15px;
  border-radius: 10px;
  background: #fff;
}

.animate {
  display: block;
  text-decoration: none;
}
.hint {
  border-radius: 5px;
  position: fixed;
  right: 20px;
  top: 20px;
  z-index: 2;
  max-width: 150px;
  text-align: center;
  font-size: 14px;
  padding: 8px;
  background: darkorchid;
  color: #fff;
}
button {
  outline: 0;
  color: #ff4d4f;
  background-color: transparent;
  border-color: #ff4d4f;
  text-shadow: none;
  border-width: 2px;
  height: 32px;
  padding: 0 15px;
  font-size: 14px;
  border-radius: 4px;
  border-style: outset;
  -webkit-appearance: button;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.045);
}
